‘Abdullah bin Abbas (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings of Allah be upon him) was a servant who acted according to Allah’s command and was commissioned by Him. He gave us three special instructions in comparison to others: He commanded us 1) to perform ablution completely, 2) not to eat charity, and 3) not to let a donkey loose among mares.

Imam Tirmidhi says:
1- This hadith is Hasan Sahih.
2- Sufyan Thawri narrated from Abu Jahdam and mentioned the chain of this hadith as follows, «عن عبيد الله بن عبد الله بن عباس عن ابن عباس» .
3- I heard Muhammad bin Ismail Bukhari say that Thawri’s narration is not preserved; there is a mistake from Thawri in it. The correct narration is the one reported by Ismail bin Ulayyah and Abdulwarith bin Sa’id from Abu Jahdam, Abu Jahdam from Abdullah bin Ubaydullah bin Abbas, and Ubaydullah from Ibn Abbas (may Allah be pleased with them both).
4- There is also a narration in this chapter from Ali (may Allah be pleased with him).